DS21FT42 Maxim Integrated Products, DS21FT42 Datasheet - Page 59

• Manufacturer Part Number: DS21FT42
• Description: IC FRAMER T1 4X3 12CH 300-BGA
• Manufacturer: Maxim Integrated Products

Specifications of DS21FT42

• Controller Type: T1 Framer
• Interface: Parallel/Serial
• Voltage - Supply: 2.97 V ~ 3.63 V
• Current - Supply: 225mA
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 300-BGA
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

TC1 TO TC24: TRANSMIT CHANNEL REGISTERS
(Address=40 to 4F and 50 to 57 Hex)
(for brevity, only channel one is shown; see Table 8-1 for other register address)
TCC1/TCC2/TCC3: TRANSMIT CHANNEL CONTROL REGISTER
(Address=16 to 18 Hex)
15.2 RECEIVE SIDE CODE GENERATION
In the receive direction there are also two methods by which channel data to the backplane can be
overwritten with data generated by the framer. The first method which is covered in Section 15.2.1 was a
feature contained in the original DS21Q41 while the second method which is covered in Section 15.2.2 is
a new feature of the DS21Q42.
15.2.1
The first method on the receive side involves using the Receive Mark Registers (RMR1/2/3) to determine
which of the 24 T1 channels should be overwritten with either a 7Fh idle code or with a digital milliwatt
pattern. The RCR2.7 bit will determine which code is used. The digital milliwatt code is an 8 byte
repeating pattern that represents a 1 kHz sine wave (1E/0B/0B/1E/9E/8B/8B/9E). Each bit in the RMRs,
represents a particular channel. If a bit is set to a one, then the receive data in that channel will be
replaced with one of the two codes. If a bit is set to zero, no replacement occurs.
(MSB)
(MSB)
CH16
CH24
CH8
C7
SYMBOL
SYMBOL
CH1 - 24
C7
C0
CH15
CH23
CH7
Simple Code Insertion
C6
TCC1.0 - 3.7
POSITION
POSITION
CH14
CH22
CH6
C5
TC1.7
TC1.0
CH13
CH21
CH5
C4
NAME AND DESCRIPTION
NAME AND DESCRIPTION
Transmit Code Insertion Control Bits
0 = do not insert data from the TC register into the transmit
data stream
1 = insert data from the TC register into the transmit data
stream
MSB of the Code (this bit is transmitted first)
LSB of the Code (this bit is transmitted last)
CH12
CH20
CH4
C3
59 of 114
CH11
CH19
CH3
C2
CH10
CH18
CH2
C1
(LSB)
CH17
(LSB)
CH1
CH9
C0
TCC1 (16)
TCC2 (17)
TCC3 (18)
TC1 (50)